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This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.

Chemical and radiological sample results

MS0110011 , Entergy Operations, Inc

22 of the 53 analytes this system has been tested for have been detected at least once, across 237 samples on record.

The other 31 were tested for and never found. An analyte is counted here if any result on record measured it, so this covers the whole history and not the samples listed below.

Across all 237 samples on record, detections range from July 7, 1993 to January 28, 2026. These figures cover the whole record.

What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.

What has been detected, ever

Every analyte measured above its reporting level at any point in this system’s record, most often detected first. This is not limited to the samples listed below.

Every analyte ever detected for Entergy Operations, Inc, with how many results found it and when it was first and last detected. Covers the whole record, not only the samples listed below.
Analyte Kind Detected in First detected Last detected
Copper, Free 1022 Inorganic Chemical 153 of 154 results Jul 7, 1993 Jul 6, 2022
Lead 1030 Inorganic Chemical 89 of 154 results Jul 7, 1993 Jul 10, 2019
Nitrate-Nitrite 1038 Inorganic Chemical 23 of 23 results May 3, 2004 Jan 28, 2026
Nitrate 1040 Inorganic Chemical 23 of 23 results May 3, 2004 Jan 28, 2026
TTHM 2950 Organic Chemical 12 of 13 results May 10, 2004 Dec 15, 2025
Barium 1010 Inorganic Chemical 11 of 11 results Mar 12, 2002 Mar 11, 2025
Chromium 1020 Inorganic Chemical 11 of 11 results Mar 12, 2002 Mar 11, 2025
Fluoride 1025 Inorganic Chemical 11 of 11 results Mar 12, 2002 Mar 11, 2025
Arsenic 1005 Inorganic Chemical 10 of 11 results Jan 26, 2004 Mar 11, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 9 of 12 results Jun 4, 2007 Mar 13, 2025
Nickel 1036 Inorganic Chemical 9 of 11 results Mar 12, 2002 Mar 11, 2025
Chloroform 2941 Organic Chemical 6 of 7 results Sep 13, 2006 Dec 15, 2025
Bromoform 2942 Organic Chemical 6 of 7 results Sep 13, 2006 Dec 15, 2025
Bromodichloromethane 2943 Organic Chemical 6 of 7 results Sep 13, 2006 Dec 15, 2025
Dibromochloromethane 2944 Organic Chemical 6 of 7 results Sep 13, 2006 Dec 15, 2025
Selenium 1045 Inorganic Chemical 5 of 11 results Jan 26, 2004 Apr 21, 2014
Dichloroacetic Acid 2451 Organic Chemical 3 of 5 results Jul 12, 2012 Aug 18, 2014
Dibromoacetic Acid 2454 Organic Chemical 3 of 5 results Jul 12, 2012 Aug 18, 2014
Sulfate 1055 Inorganic Chemical 2 of 2 results Mar 12, 2002 Jan 26, 2004
Sodium 1052 Inorganic Chemical 1 of 1 result Feb 3, 2021 Feb 3, 2021
Monochloroacetic Acid 2450 Organic Chemical 1 of 5 results Jul 16, 2018 Jul 16, 2018
Uranium-238 4009 Radionuclide 1 of 1 result Jan 23, 2006 Jan 23, 2006

No date range is applied: this list draws on every sample on record. Show the last two years only.

The most recent samples, result by result

The table below lists 101–110 of 237 samples, newest first — collected July 26, 2007 to June 9, 2010. The summary above covers all 237.

57 results from the 10 samples listed here: 22 detected, 35 not detected. Across the whole record it is 401 of 842. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

Chemical and radiological sample results for Entergy Operations, Inc, every result from 101 to 110 of 237 samples shown, newest first. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Jun 9, 2010
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
100610-009HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Jun 9, 2010, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jun 9, 2010, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jun 9, 2010, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jun 9, 2010, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jun 9, 2010, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0 This result is recorded as a detection, and the figure the agency wrote — "0.00" — is zero to the precision it was written to. Read the zero as "smaller than the written figure resolves", not as "none present". SDWIS holds a separate numeric concentration that Drinking Water Watch does not publish, so this endpoint does not carry it either; no more precise magnitude is available here. The agency recorded a value but no unit of measure for it. The unit is NOT inferable from the analyte: many analytes are reported in more than one unit — TTHM and HAA5 in both MG/L and UG/L — so there is no per-analyte default to fall back on. The number is published as it stands and must not be compared to a limit. The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected Jun 9, 2010, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2008 – Dec 31, 2010
Collected
Jun 9, 2010
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
100610-009TH
Laboratory
MSDH Lab
1.63 ug/l , sample collected Jun 9, 2010, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
2.41 ug/l , sample collected Jun 9, 2010, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
2.24 ug/l , sample collected Jun 9, 2010, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
3.18 ug/l , sample collected Jun 9, 2010, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
9.46 ug/l , sample collected Jun 9, 2010, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2008 – Dec 31, 2010
Collected
May 26, 2010
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
100527-055NI
Laboratory
MSDH Lab
1.12 mg/l , sample collected May 26, 2010, sampling point TF080 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2010 – Dec 31, 2010
1.12 mg/l , sample collected May 26, 2010, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected May 26, 2010, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2010 – Dec 31, 2010
Collected
Mar 23, 2009
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
090324-056NI
Laboratory
MSDH Lab
1.37 mg/l , sample collected Mar 23, 2009, sampling point TF080 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2009 – Dec 31, 2009
1.32 mg/l , sample collected Mar 23, 2009, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2009 – Dec 31, 2009
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Mar 23, 2009, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2009 – Dec 31, 2009
Collected
May 12, 2008
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
080513-014NI
Laboratory
MSDH Lab
0.97 mg/l , sample collected May 12, 2008, sampling point TF080 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2008 – Dec 31, 2008
0.97 mg/l , sample collected May 12, 2008, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2008 – Dec 31, 2008
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected May 12, 2008, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2008 – Dec 31, 2008
Collected
Apr 16, 2008
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
080417-002VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Benzene 2990 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Toluene 2991 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 16, 2008, sampling point TF080 Styrene 2996 EPA method 524.2 Jan 1, 2005 – Dec 31, 2010
Collected
Mar 24, 2008
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
080325-058CN
Laboratory
MSDH Lab
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2008 – Dec 31, 2010
Collected
Mar 24, 2008
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
080325-009IN
Laboratory
MSDH Lab
0.00075 mg/l , sample collected Mar 24, 2008, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.044413 mg/l , sample collected Mar 24, 2008, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.005908 mg/l , sample collected Mar 24, 2008, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.318 mg/l , sample collected Mar 24, 2008, sampling point TF080 Fluoride 1025 EPA method 380-75WE Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0002 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.04981 mg/l , sample collected Mar 24, 2008, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
0.002368 mg/l , sample collected Mar 24, 2008, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 24, 2008, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Collected
Jul 26, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070727-084PB
Laboratory
MSDH Lab
0.0903 mg/l , sample collected Jul 26, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2006 – Dec 31, 2008
0.0026 mg/l , sample collected Jul 26, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2006 – Dec 31, 2008
Collected
Jul 26, 2007
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
070727-083PB
Laboratory
MSDH Lab
0.0355 mg/l , sample collected Jul 26, 2007, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2006 – Dec 31, 2008
0.0008 mg/l , sample collected Jul 26, 2007, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2006 – Dec 31, 2008

Routine (10).